a. Birds and land snails are uricotelic animals.

b. Mammals and frogs are ureotelic animals

c. Aquatic amphibians and aquatic insects are ammonotelic animals

d. Birds and reptiles are ureotelic

correct option –( d )

explanation – ureotelic means excretion of excess nitrogen as urea . So birds and reptiles are not ureotelic .

hence correct answer is Birds and reptiles are ureotelic